My Ford manual recommends against splitting up the dual rear tires. Just swap fronts and rears side to side. I don't think I'll even do that, though, unless I see some unusual wear. I've got 30k miles on my 2020 and will probably replace them in another two years regardless of mileage (6 years after DOT date).
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retired USCG aviator
2020 Jayco Greyhawk 29MV/2021 MINI Cooper toad
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